Dental chair.



H. E. WEBER.

DENTAL 'CHAIR. APPLICATION FILED Nov. 6,1911.

Patented Oct. 19, 1915.

2 SHEETS-SHEET].

COLUMBIA PLANOERAFH c0. WASHINGTON, D. c.

H. E. WEBER.

DENTAL CHAIR.

APPLICATION man NOV. 6. 1911.-

Patented Oct. 19, 1915.

2 SHEETSSHEET 2 COLUMBIA PLANOURAPH cm, WASHINGTON, D. c.

2O ordinary seatas a footrest. Th s ob ect s i To. all whom it may concern;

HENRY E. WEBER, on cannon, OHIO.

DENTAL CHAIR.

Be it known that I, HENRY EQW EBER, a

citizen of the United States, residing at Canton, in the county of Stark and State of Ohio, have invented certain new and useful Improvements in Dental Chairs, of

' which the following is a specification.

' thereof. Y

blhe. invention relates to a folding seat forming part of the back of an ad ustable chair of the kind generally used by dentists,

surgeons, barbers and other operators; and f the object of the improvement is to provide a secondary folding seat composed of one of; the ordinary and usual parts of. the chair structure, which is always ready and available for use without attaching or detaching any supplemental parts, and which can'be adjusted upward and downward with the back to permit the occupant to use the ordinary, headrest, and, if desired, to use the the frame of the chair-back bya pair of hinge-links at the lower ends of'the parts, and a pair of folding arms intermediate the ends of the parts, which braces serve not only to stop the folding seat when open but also serve. as arm rests for the occupant part hereof, in which i I Figure 1 1s a perspective view of the upper portion of a dental cha r with one ordinarv arm rest rotated outward. showing the folding seat in its normal closed position a ainst the back frame: Fig. 2, a detached side elevation of the chair-back, partly in r section. showing the details of the hinge-.

' link and folding arm in closed relation, and '1 i alsoshowing-the open position of thep arts vin broken linesj' Fig. 3, a perspective view of the, upper portion of a dental chair with one ordinary armrest rotated out of view,

showing the folding seat opened downward intprone position with respect to the back.

preferred embodiment of the invention, thus set forth in general terms, is illustrated V .j in the 'accompanving drawings, forming 35 Specification of Letters Patent. Patented ()ct, 19,1915 7 Application filed November 6, 1911. Y serial No. 658,834.

orffolding seat 5 thereon, the head rest 6, I

and theusual lowerlparts of a dental chair not shown in the drawings. v The back-frame t ispreferably pivoted above to the upper end of the back slide 7 whichhas an upward and downward sliding connection with the back standard 3; and the back-frame is also preferably provided. below with a pivoted detent 8 adapted to engage in the rack '9, provided in the slide, so as to tilt the back at different angles with reference to the back standard.

[The back-frame a is preferably composed of thebase plate 10 and the forwardly projecting. rim flange 11, within which flange the shallow bl'oclppad 12 is preferably'secured to the base plate leaving an interval or rim recess 13 betweenthe rim and the edges offthe block-pad, which block-pad sub stantially fills the cavity. of the back frame except the rim recess, and furnishes a back rest for the occupant of the secondary folding seat. r

. One end of each hinge-link let is pivoted to the back-frame at 15in the rim recess 13 at each lower corner of the back-frame, and the other end of each hinge-link is pivoted at 16 to the frame plate 17 of the folding seat 5 at an interval from the lower or rear end thereof, and "this end of each link is 7 adapted to rotate from an upright position within the rim recess as shown in full lines in' Fig. '2to a depending position as shown in full lines in Figs. 3 and 4; the notches 18 being provided in the rim flange 11' of the back frame' forreceiving the hinge-links in their depending position, and the bottom 19 of these notchesfurnish abutments forstop- 1112' the rearward rotation of the links. .Each'folding arm is composed of the relativel-yi-short section 20 and long section 21 jointed together at 22, the other end ofceach short section being pivoted at 23 to the framelate of the folding seat at a substantial distance from its upper or forward end, and the other end of each long section being pivoted at 24 to the back-frame in the rim recess at a substantial distance above the pivots of the hinge-links. By means of these connections, the folding seat is adapted to be folded or closed in its normal position as a cushion-pad against the backframe, in Which 'relationof the partstheg hinge links and the folding arms-arereceived Within the rim recess-ofthe hack-- frame so as to permit the frame-plate of the f;

' other hand the folding seat is adapted-to be swung forvard and downwardon, the various pivots into the open or prone position for use 'asa secondaryseat, as shown I in Figs13 and 4; in which movement the;

folding seat to close tightly against theyfor- \vardcdge of the rim flange 11 of theloacks' frame, as shown in Fig. 2; While onftlie lower endof the folding seat} swings not only doWnWard,but iscarried by the hingelinks below and to the rear of the lower end :of the back-frame until stopped by the abutment of the hinge-links against the bottoms of the rim notches, and the foldinga'rms' I Gopies ofthis patent obtei'neii f carry the upperend of the folding seat for-1 ward and downward until it reaches the prone position for use as a secondary seat,

in which relation of the parts the long sec-T eons ofthe folding armsextend forward and slightly downward and'the short; sections thereof extend downward With the'intermediate oints above the plane of the end pivots, thus forming suitable arm 'rests forthe occupant of the folding seat. A furtherstraightening of the 'foldingxarinsis ie-7 fvented by-a suitable stop, Which as shown,

is} formed by the abutment of the down; \vardlv extending lug 25 of the short section 20 of each arm with the end26 of the notch '27 provided in. the frame plate l7 'ofthe' I folding seat ;'Which stop, inconjunction with the abutment of the hinge links against the back frame, serves to sustain the folding seat in'the prone position. And it is evident that When the seat is foldedupward on the hinge links, the joint of the arm sections Will right position against the hack I-fraine,

The spring latches 28 arie'preferably pro vided on each side of the foldingseahwhich arm pivots.

away: 7

use as a back rest for' the occupant ofthe 7 ordinary" seat; and, at the same time, these latches will.' autonri'a'tically disengage from j i the jback-fraine when the, iipper endof the folding seat is pulled forward for rotating a 7 it to its-prone positionforuse asa secondary 1 f seat. For usej as.afseat the'face ofthe frame-plate 17 is preferably'finished bythe; 1 thin'pa d 30, as of leather, theedges of which" arelocatedinside'the hingelink and folding ltisevident that the folding seat thus formedof the 'cushion pad of the ordinary" 'seat back, may 'begiven all, the sliding and tilting adjustments which pertain to the"-- cushion-pad when usedas a back rest; that thehead rest is,therefore, available for'the' V us'eof the ilocc upant of the secondary seat; 'andlfinall'y" that the ordinary seat may be used, if desirable-or necessary, as a foot rest Such occupantf I claim? 1; ALcha" including a1, pack; a, folding seat' hinged' links connecting. the loTWer end? of thehajck vith the seat at'a point'a'djacent to its lower rear end, ivhereby the lower end portion of the seaticanlsiving from a es ti'onin front offto af'position helow' and in "rear of the lower end of ;the'back; and-arm 8 6i links pivoted tothe hack and seat and each having an upwardly folding ntermediate" prone position."

2. A; chain including talk, a, folding joint vvith'means for stopping theiseat in 85" seat, hinged links connecting.the lo verxend" V of the back'with the seat at a point adjacentk to its lower rear end, Whereby the lower end portion'ofthe seatcan-swing from a posis tion' in front of to "a position below and: in rear of 'thelower end of thebacktand arfn links pivoted to the back and seat and each havingkan upjivarldly "folding inter-mediate: joint 'With" means for-stopping the seat in prone position with the arm j oints" above the, pla e m i gt rou the seat and b 1 

